One problem related to water pump has been reported for the 2006 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota 4Runner based on all problems reported for the 2006 4Runner.
Timing belt cover is leaking oil with 36000 miles. After researching online this is a common problem. Was covered under warranty but not now. They gave me an estimate of 1900. 00 to replace gasket an water pump. Leaks oil while parked in garage.